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uniform float ImageTransparencyCutoff = 0.1;
uniform sampler2D image;
uniform bool imageNearest;
uniform float alpha = 0.5;
uniform vec2 invertedViewportSize;
uniform vec4 viewvecs[3];
uniform vec3 materialDiffuseColor;
uniform vec3 materialSpecularColor;
uniform float materialRoughness;
uniform float shadowMultiplier = 0.5;
uniform float lightMultiplier = 1.0;
uniform float shadowShift = 0.1;
uniform float shadowFocus = 1.0;
#ifdef NORMAL_VIEWPORT_PASS_ENABLED
in vec3 normal_viewport;
#endif /* NORMAL_VIEWPORT_PASS_ENABLED */
#ifdef V3D_SHADING_TEXTURE_COLOR
in vec2 uv_interp;
#endif
#ifdef V3D_SHADING_VERTEX_COLOR
in vec3 vertexColor;
#endif
#ifdef V3D_LIGHTING_MATCAP
uniform sampler2D matcapImage;
#endif
layout(std140) uniform world_block
{
WorldData world_data;
};
layout(location = 0) out vec4 transparentAccum;
layout(location = 1) out
float revealageAccum; /* revealage actually stored in transparentAccum.a */
void main()
{
vec4 diffuse_color;
#if defined(V3D_SHADING_TEXTURE_COLOR)
diffuse_color = workbench_sample_texture(image, uv_interp, imageNearest);
if (diffuse_color.a < ImageTransparencyCutoff) {
discard;
}
#elif defined(V3D_SHADING_VERTEX_COLOR)
diffuse_color = vec4(vertexColor, 1.0);
#else
diffuse_color = vec4(materialDiffuseColor, 1.0);
#endif /* V3D_SHADING_TEXTURE_COLOR */
vec2 uv_viewport = gl_FragCoord.xy * invertedViewportSize;
vec3 I_vs = view_vector_from_screen_uv(uv_viewport, viewvecs, ProjectionMatrix);
#ifdef NORMAL_VIEWPORT_PASS_ENABLED
vec3 nor = normalize(normal_viewport);
#endif
/* -------- SHADING --------- */
#ifdef V3D_LIGHTING_FLAT
vec3 shaded_color = diffuse_color.rgb;
#elif defined(V3D_LIGHTING_MATCAP)
bool flipped = world_data.matcap_orientation != 0;
vec2 matcap_uv = matcap_uv_compute(I_vs, nor, flipped);
vec3 matcap = textureLod(matcapImage, matcap_uv, 0.0).rgb;
vec3 shaded_color = matcap * diffuse_color.rgb;
#elif defined(V3D_LIGHTING_STUDIO)
vec3 shaded_color = get_world_lighting(
world_data, diffuse_color.rgb, materialSpecularColor, materialRoughness, nor, I_vs);
#endif
#ifdef V3D_SHADING_SHADOW
float light_factor = -dot(nor, world_data.shadow_direction_vs.xyz);
float shadow_mix = smoothstep(shadowFocus, shadowShift, light_factor);
shaded_color *= mix(lightMultiplier, shadowMultiplier, shadow_mix);
#endif
/* Based on :
* McGuire and Bavoil, Weighted Blended Order-Independent Transparency, Journal of
* Computer Graphics Techniques (JCGT), vol. 2, no. 2, 122–141, 2013
*/
/* Listing 4 */
float z = linear_zdepth(gl_FragCoord.z, viewvecs, ProjectionMatrix);
float weight = calculate_transparent_weight(z, alpha);
transparentAccum = vec4(shaded_color * weight, alpha);
revealageAccum = weight;
}
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